Ocean-atmosphere interaction over sea surface temperature front along Kuroshio Extension and North Pacific subtropical front.
| Project/Area Number |
17340137
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Hokkaido University |
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Principal Investigator |
TANIMOTO Youichi Hokkaido University, Faculty of Environmental Earth Science, Associate Professor (00291568)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Hisashi University of Tokyo, Department of Earth and Planetary Science, Associate Professor (10251406)
KOBASHI Fumiaki Tokyo University of Marine Science and Technol.ogy, Faculty of Marine Technol.ogy, Associate Professor (80377077)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,180,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥780,000)
Fiscal Year 2007: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2006: ¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 2005: ¥7,100,000 (Direct Cost: ¥7,100,000)
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| Keywords | Kuroshio Extension / Ocean-atmosphere interaction / Atmospheric boundary layer / Cloud regime / GPS radio sonde sounding / Baiu / 海上気象観測 / 黒潮続流域 |
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| Research Abstract |
Over the western North Pacific east of the Japan, sea surface temperature (SST) shows a steep front across the Kuroshio Extension (KE). The SST gradient near the KE is 5℃/200 km through seasons, therefore changes in SST are very large in that region. In the present study, we conducted global positioning system (GPS) radio sonde atmospheric soundings across the front in July 2005 (January 2006) as a research cruise of research vessel (R/V) Roger Revelle, Scripps Institute of Oceanography (R/V Hakuho-maru, Ocean Research Institute, University of Tokyo).
In early summer, whilst the lower atmosphere overlying the KE region exhibits synoptic disturbances, SST front is nearly the same for several weeks during the cruise due the large inertia of the ocean. Analyses of the atmospheric soundings and ceilometer measurement show that the vertical structure of atmospheric boundary layer is modified across the front. In case of warm/moist (cold/dry) air mass overlying the KE region, a cloud regime shift from cumulus to low-level stratus, occasionally to fog (from stratus with solid cloud deck to broken stratus scattering with lower cloud base) is observed across warm-to-cold SST.
In deep winter, the near surface is always unstable because of warm ocean and cool/dry atmosphere. Hence, the main inversion is formed at the top of well-mixed layer. Temporal variation of the mixed layer top (MLT), which is mostly corresponding to the observed cloud base, is well correlated with surface heat flux. The lag correlation becomes the maximum when the flux leads by 5-12 hours the MLT. After a passage of synoptic storm, the surface heat flux occasionally exceeded 800W m^<-2> and thereby the stratus and stratocumulus were formed at the MLT.
These observational findings indicate that the marine atmospheric boundary layer is modified by the spatial changes in SST along the KE front even though the overlying atmosphere displays its synoptic distrubances.
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Report
(4 results)
Research Products
(169 results)
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[Journal Article] Atmospheric sounding over the winter Kuroshio Extension: Effect of surface stability on atmospheric boundary layer structure2006
Author(s)
Tokinaga, H., Y. Tanimoto, M. Nonaka, B. Taguchi, T. Fukamachi, S. -P. Xie, H. Nakamura, T. Watanabe, and I. Yasuda
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Journal Title
Geophysical Research Letters 33, L04703
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Variation of marine atmospheric boundary layer observed over the winter Kuroshio Extension2008
Author(s)
Kobashi, F., Y. Tanimoto, T. Murayama, N. Iwasaka, H. Tokinaga, M. Nonaka, and M. Konda
Organizer
2008 Ocean Sciences Meeting
Place of Presentation
Orlando, Florida, USA, The Orange County Convention Center
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] Variation of marine atmospheric boundary layer observed over the winter Kuroshio Extension2008
Author(s)
Kobashi, F., Y. Tanimoto, T. Murayama, N. Iwasaka, H. Tokinaga, M. Nonaka, and M. Konda
Organizer
2008 Ocean Sciences Meeting
Place of Presentation
The Orange County Convention Center, Orlando, Florida, USA,
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[Presentation] Influence of a mid-latitude oceanic frontal zone on the mean state of the tropospheric circulation and its annular variability2007
Author(s)
Nakamura, H., T. Sampe, A. Goto, D. Hotta, W. Ohfuchi, and S.-P. Xie
Organizer
15th Conf. on Air-Sea Interaction, Amer. Meteorol. Soc.
Place of Presentation
Portland, OR, U.S.A, The Doubletree Hotel-Llyod Center
Description
「研究成果報告書概要(和文)」より
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[Presentation] 中緯度海洋前線帯の大気海洋相互作用と大気大循環2007
Author(s)
中村尚, 三瓶岳昭, 後藤敦史, 野中正見, 谷本陽一, 高谷康太郎, 田口文明, 謝 尚平
Organizer
東京大学海洋研究所国際沿岸海洋研究センター研究集会「西部北太平洋海域における大気海洋相互作用II-黒潮続流域におけるフラックス観測-」
Place of Presentation
東京大学海洋研究所国際沿岸海洋研究センター
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] Influence of a mid-latitude oceanic frontal zone on the mean state of the tropospheric circulation and its annular variability2007
Author(s)
Nakamura, H., T. Sampe, A. Goto, D. Hotta, W. Ohfuchi, and S.-P. Xie
Organizer
15th Conf. on Air-Sea Interaction, Amer. Meteorol. Soc.
Place of Presentation
The Doubletree Hotel-Llyod Center, Portland, OR, U.S.A,
Related Report
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[Presentation] On the significance of mid-latitude oceanic frontal zones in the mean state and dominant variability of the tropospheric circulation2007
Author(s)
Nakamura, H., T. Sampe, A. Goto, D. Hotta, W. Ohfuchi, S.-P. Xie
Organizer
XXIV General Assembly of IUGG, OS008
Place of Presentation
University of Perugia, Perugia, Italy,
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